McCaul is investigating the withdrawal from Afghanistan. Republicans, and some Democrats, say there has never been a full accounting of the chaotic operation, in which 13 U.S. service members were killed at Kabul's airport.

McCaul has for months been seeking a "dissent channel" cable sent in July 2021 that a Wall Street Journal article in August 2021 said warned top officials of the potential collapse of Kabul soon after the withdrawal of U.S. troops.

(Reporting by Simon Lewis and Humeyra Pamuk, Jasper Ward; Editing by Chris Reese)